Silvester Petra Sancta (Rome 1590 – Rome, May 6, 1647) was an Italian Jesuit monk, and heraldist. His name is also spelt as Sylvester Petra Sancta, Petrasancta, in Italian Padre Silvestro da Pietrasanta. Pseudonym: Coelius Servilius
Later he settled in Rome and published his treatise on heraldry there. During the mid-1620s, he published a translation in Liège and since 1631 he was also the editor of a book published from Antwerp. That means during the late 1620s and the early 1630s he stayed in the Spanish Low Countries and the neighboring territories. In 1634 he published his first book touching the topic of heraldry in Antwerp; but his main heraldic work containing the hatching system was published in 1638 in Rome. In 1643, he was appointed the Apostolic Visitator for the Order of Piarists. As a result of his malicious visitation, Pope Innocent X reduced the order in his breve Ea quae pro felice on March 16, 1646 into a secular congregation subordinated to the local bishops. The order was rehabilitated in 1656 and renewed in 1669.
Today we know the name of Petra Sancta first of all as the inventor of modern hatching method in heraldry published in 1638. However, his hatching system is fully identical with that of de la Colombière from 1639. For this reason, de la Colombière accused Silvester Petra Sancta of copying his method and incorrectly publishing it in his 1638 work, one year before the same hatching system was published by de la Colombière. Petra Sancta provided preliminary comprehensive studies on his heraldic work in Germany and the Netherlands and that it’s very likely that he was acquainted with the idea of hatching and the earlier existing hatching methods from the Dutch engravers before he developed his own hatching system.
His 1638 book is sometimes dated between 1636 and 1638. It would support the primacy of hatching by Petra Sancta if we consider that in 1635 de la Colombière by all probability stayed in Grenoble. But these data are less credible.
According to some other opinion, Petra Sancta first applied the hatching for the arms in his work titled De Symbolis Heroicis, Libri IX (Antverpiae, 1634), but it has no hatching table. According to the data from the Plantin-Moretus archive, the emblems of the book were prepared by artist-engravers who were in the service of the Jesuit monks first and then between December 1631 and June 1634 it was redone by André Pauwels (Andries Pauli, 1600-1639) for Batlhasar Moretus (1574-1641). The allegorical title page of this book was prepared by Rubens where Mercur symbolizes the arts. The explanation on the mentioned engraving is given in page 480 of the book. Petra Sancta characterizes the title page of this book in the conclusion as an expression of the power of emblematic way of illustration. The book also contains the portrait of his lord Carafa, engraved in 1632 by Michel Natalis (Liège, 1610–1668). At the escutcheon of this engraving we can see a kind of a screening or hatching as well.
Thus it’s obvious that Petra Sancta got the model for his heraldic hatching system from the illustrators and publishers of his books in the Low Countries. It is possible that these engravers also knew at least two earlier hatching systems by Zangrius in 1600, and Francquart in 1623. The techniques of heraldic hatching might have even been carried forward by the guilds of engravers one after another.
The arms on the title page of one of the Francesco Corbelletti’s 1639 publications, i. e. the Rome publisher of Petra Sancta, already represents a complete example of heraldic hatching. That means Corbelletti took over the heraldic hatching system already in the next year after the 1638 system of Petra Sancta appeared. If we consider the time needed to prepare the engravings and the approval by the censure, Corbelletti must know the hatching system of Petra Sancta even before 1638.
Aegidius Gelenius was deeply influenced by Petra Sancta; the men met several times in Cologne. Gelenius's hatching system from 1645, however, is identical only at two points with that of Petra Sancta.
Published by Francesco Corbelletti.